It's just sibling rivalry: Mark Zuckerberg's younger sister now works for Google

When Mark Zuckerberg famously announced his marriage to long-time girlfriend Priscilla Chan, his sister Arielle posted on her Facebook page: ‘Balls. Now I’m the only unmarried Zuckerberg.’

And the sibling rivalry was undoubtedly felt Tuesday, as the youngest Zuckerberg recently started working for a social marketing company which was acquired by Google.

Wildfire is a social marketing firm based in Redwood City, California, and helps marketers reach their target audience using social media.

Social rivalry: Mark Zuckerberg's younger sister Arielle, pictured, works for Wildfire, which was just acquired by Google

Target audience: Wildfire was purchased by Google - it is a social media marketing site that was started in 2008

But the acquisition by Google pits Arielle against her brother, who invented Facebook and currently serves as its CEO and chairman.

Big brother: Mark Zuckerberg, pictured last month, has employed sibling Randi, who worked as the company's marketing manager for several years

Their sibling Randi – who worked at Facebook for years – noted the awkwardness in a tweet, writing: ‘Congrats Wildfire! There are officially more Zuckerberg family members working for Google than Facebook’ followed by the hash tag ‘awkward.'

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According to CNNMoney, Randi is working on a reality series with Bravo about Silicon Valley entrepreneurs.

Before that, she had worked six years as the director of marketing for Facebook. She left to start her own media company.

Arielle, who graduated from Claremont McKenna College in 2011 and is in her early 20s, currently works as a junior product manager for Wildfire.

According to her LinkedIn profile, she's been working at the company since graduation.

Rumours fluttering around the web speculated that Google purchased the company for somewhere around $250million, but a Google rep said the deal is not coming under regulatory review.

Google wrote on its official blog that it was happy to announce the acquisition, calling it a ‘platform for brands to manage their pages, apps, tweets, videos, sponsorships, ads, promotions and more, all in one place.’

Google added: ‘With Wildfire, we’re looking forward to creating new opportunities for our clients to engage with people across all social services. We believe that better content and more seamless solutions will help unlock the full potential of the web for people and businesses.’

Meanwhile, Facebook shares went up on Tuesday’s markets by 6.2 per cent to $21.71, their third consecutive record closing low, after a lacklustre quarterly report last week showed decelerating user growth.

All in the family: Randi Zuckerberg tweeted her congratulations, hinting other Zuckerbergs work for Google as well